Figure 4: Monthly Variation in Chicago’s a.m. and p.m. Congested Hours due to Seasonal Factors,,
Difference in congested hours per day from the trendline,,
,Chicago a.m. seasonality,Chicago p.m. seasonality
Jan,-0.245165442,-0.605827169
Feb,-0.084182157,-0.147749343
Mar,0.035632796,0.003986149
Apr,-0.110858715,-0.273936229
May,0.225472607,0.140869226
Jun,0.239583226,0.286036385
Jul,0.080465845,0.156858877
Aug,0.075731797,0.162688703
Sep,0.317944749,0.356786195
Oct,0.307007035,0.239467687
Nov,0.032339987,-0.161825154
Dec,-0.873971728,-0.157355328
"SOURCE: Calculated from data used in preparation of Federal Highway Administration, Urban Congestion Report, April 2004–April 2007.",,